The Spanning Sync public beta is now available again after the servers took a pasting midweek. First impressions are mixed. First sync took a few minutes but sync’s after that seem to be quite fast. However it seems to be one way at the moment. Syncs from iCal to Google are working but not from Google to iCal. Still, early days and teething troubles are expected.
I should probably have mentioned that this applies to Mac iCal users only and is an app for syncing Google to iCal calendars.